1 /* 2 * Cirrus Logic CS8900A Ethernet 3 * 4 * (C) 2009 Ben Warren , biggerbadderben@gmail.com 5 * Converted to use CONFIG_NET_MULTI API 6 * 7 * (C) 2003 Wolfgang Denk, wd@denx.de 8 * Extension to synchronize ethaddr environment variable 9 * against value in EEPROM 10 * 11 * (C) Copyright 2002 12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 13 * Marius Groeger <mgroeger@sysgo.de> 14 * 15 * Copyright (C) 1999 Ben Williamson <benw@pobox.com> 16 * 17 * See file CREDITS for list of people who contributed to this 18 * project. 19 * 20 * This program is loaded into SRAM in bootstrap mode, where it waits 21 * for commands on UART1 to read and write memory, jump to code etc. 22 * A design goal for this program is to be entirely independent of the 23 * target board. Anything with a CL-PS7111 or EP7211 should be able to run 24 * this code in bootstrap mode. All the board specifics can be handled on 25 * the host. 26 * 27 * This program is free software; you can redistribute it and/or modify 28 * it under the terms of the GNU General Public License as published by 29 * the Free Software Foundation; either version 2 of the License, or 30 * (at your option) any later version. 31 * 32 * This program is distributed in the hope that it will be useful, 33 * but WITHOUT ANY WARRANTY; without even the implied warranty of 34 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 35 * GNU General Public License for more details. 36 * 37 * You should have received a copy of the GNU General Public License 38 * along with this program; if not, write to the Free Software 39 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 40 */ 41 42 #include <common.h> 43 #include <command.h> 44 #include <asm/io.h> 45 #include <net.h> 46 #include <malloc.h> 47 #include "cs8900.h" 48 49 #undef DEBUG 50 51 /* packet page register access functions */ 52 53 #ifdef CONFIG_CS8900_BUS32 54 55 #define REG_WRITE(v, a) writel((v),(a)) 56 #define REG_READ(a) readl((a)) 57 58 /* we don't need 16 bit initialisation on 32 bit bus */ 59 #define get_reg_init_bus(r,d) get_reg((r),(d)) 60 61 #else 62 63 #define REG_WRITE(v, a) writew((v),(a)) 64 #define REG_READ(a) readw((a)) 65 66 static u16 get_reg_init_bus(struct eth_device *dev, int regno) 67 { 68 /* force 16 bit busmode */ 69 volatile u8 c; 70 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); 71 uint8_t volatile * const iob = (uint8_t volatile * const)dev->iobase; 72 73 c = readb(iob); 74 c = readb(iob + 1); 75 c = readb(iob); 76 c = readb(iob + 1); 77 c = readb(iob); 78 79 REG_WRITE(regno, &priv->regs->pptr); 80 return REG_READ(&priv->regs->pdata); 81 } 82 #endif 83 84 static u16 get_reg(struct eth_device *dev, int regno) 85 { 86 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); 87 REG_WRITE(regno, &priv->regs->pptr); 88 return REG_READ(&priv->regs->pdata); 89 } 90 91 92 static void put_reg(struct eth_device *dev, int regno, u16 val) 93 { 94 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); 95 REG_WRITE(regno, &priv->regs->pptr); 96 REG_WRITE(val, &priv->regs->pdata); 97 } 98 99 static void cs8900_reset(struct eth_device *dev) 100 { 101 int tmo; 102 u16 us; 103 104 /* reset NIC */ 105 put_reg(dev, PP_SelfCTL, get_reg(dev, PP_SelfCTL) | PP_SelfCTL_Reset); 106 107 /* wait for 200ms */ 108 udelay(200000); 109 /* Wait until the chip is reset */ 110 111 tmo = get_timer(0) + 1 * CONFIG_SYS_HZ; 112 while ((((us = get_reg_init_bus(dev, PP_SelfSTAT)) & 113 PP_SelfSTAT_InitD) == 0) && tmo < get_timer(0)) 114 /*NOP*/; 115 } 116 117 static void cs8900_reginit(struct eth_device *dev) 118 { 119 /* receive only error free packets addressed to this card */ 120 put_reg(dev, PP_RxCTL, 121 PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK); 122 /* do not generate any interrupts on receive operations */ 123 put_reg(dev, PP_RxCFG, 0); 124 /* do not generate any interrupts on transmit operations */ 125 put_reg(dev, PP_TxCFG, 0); 126 /* do not generate any interrupts on buffer operations */ 127 put_reg(dev, PP_BufCFG, 0); 128 /* enable transmitter/receiver mode */ 129 put_reg(dev, PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx); 130 } 131 132 void cs8900_get_enetaddr(struct eth_device *dev) 133 { 134 int i; 135 136 /* verify chip id */ 137 if (get_reg_init_bus(dev, PP_ChipID) != 0x630e) 138 return; 139 cs8900_reset(dev); 140 if ((get_reg(dev, PP_SelfSTAT) & 141 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) == 142 (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) { 143 144 /* Load the MAC from EEPROM */ 145 for (i = 0; i < 3; i++) { 146 u32 Addr; 147 148 Addr = get_reg(dev, PP_IA + i * 2); 149 dev->enetaddr[i * 2] = Addr & 0xFF; 150 dev->enetaddr[i * 2 + 1] = Addr >> 8; 151 } 152 } 153 } 154 155 void cs8900_halt(struct eth_device *dev) 156 { 157 /* disable transmitter/receiver mode */ 158 put_reg(dev, PP_LineCTL, 0); 159 160 /* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */ 161 get_reg_init_bus(dev, PP_ChipID); 162 } 163 164 static int cs8900_init(struct eth_device *dev, bd_t * bd) 165 { 166 uchar *enetaddr = dev->enetaddr; 167 u16 id; 168 169 /* verify chip id */ 170 id = get_reg_init_bus(dev, PP_ChipID); 171 if (id != 0x630e) { 172 printf ("CS8900 Ethernet chip not found: " 173 "ID=0x%04x instead 0x%04x\n", id, 0x630e); 174 return 1; 175 } 176 177 cs8900_reset (dev); 178 /* set the ethernet address */ 179 put_reg(dev, PP_IA + 0, enetaddr[0] | (enetaddr[1] << 8)); 180 put_reg(dev, PP_IA + 2, enetaddr[2] | (enetaddr[3] << 8)); 181 put_reg(dev, PP_IA + 4, enetaddr[4] | (enetaddr[5] << 8)); 182 183 cs8900_reginit(dev); 184 return 0; 185 } 186 187 /* Get a data block via Ethernet */ 188 static int cs8900_recv(struct eth_device *dev) 189 { 190 int i; 191 u16 rxlen; 192 u16 *addr; 193 u16 status; 194 195 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); 196 197 status = get_reg(dev, PP_RER); 198 199 if ((status & PP_RER_RxOK) == 0) 200 return 0; 201 202 status = REG_READ(&priv->regs->rtdata); 203 rxlen = REG_READ(&priv->regs->rtdata); 204 205 if (rxlen > PKTSIZE_ALIGN + PKTALIGN) 206 debug("packet too big!\n"); 207 for (addr = (u16 *) NetRxPackets[0], i = rxlen >> 1; i > 0; 208 i--) 209 *addr++ = REG_READ(&priv->regs->rtdata); 210 if (rxlen & 1) 211 *addr++ = REG_READ(&priv->regs->rtdata); 212 213 /* Pass the packet up to the protocol layers. */ 214 NetReceive (NetRxPackets[0], rxlen); 215 return rxlen; 216 } 217 218 /* Send a data block via Ethernet. */ 219 static int cs8900_send(struct eth_device *dev, 220 volatile void *packet, int length) 221 { 222 volatile u16 *addr; 223 int tmo; 224 u16 s; 225 struct cs8900_priv *priv = (struct cs8900_priv *)(dev->priv); 226 227 retry: 228 /* initiate a transmit sequence */ 229 REG_WRITE(PP_TxCmd_TxStart_Full, &priv->regs->txcmd); 230 REG_WRITE(length, &priv->regs->txlen); 231 232 /* Test to see if the chip has allocated memory for the packet */ 233 if ((get_reg(dev, PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) { 234 /* Oops... this should not happen! */ 235 debug("cs: unable to send packet; retrying...\n"); 236 for (tmo = get_timer(0) + 5 * CONFIG_SYS_HZ; 237 get_timer(0) < tmo;) 238 /*NOP*/; 239 cs8900_reset(dev); 240 cs8900_reginit(dev); 241 goto retry; 242 } 243 244 /* Write the contents of the packet */ 245 /* assume even number of bytes */ 246 for (addr = packet; length > 0; length -= 2) 247 REG_WRITE(*addr++, &priv->regs->rtdata); 248 249 /* wait for transfer to succeed */ 250 tmo = get_timer(0) + 5 * CONFIG_SYS_HZ; 251 while ((s = get_reg(dev, PP_TER) & ~0x1F) == 0) { 252 if (get_timer(0) >= tmo) 253 break; 254 } 255 256 /* nothing */ ; 257 if((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) { 258 debug("\ntransmission error %#x\n", s); 259 } 260 261 return 0; 262 } 263 264 static void cs8900_e2prom_ready(struct eth_device *dev) 265 { 266 while (get_reg(dev, PP_SelfSTAT) & SI_BUSY) 267 ; 268 } 269 270 /***********************************************************/ 271 /* read a 16-bit word out of the EEPROM */ 272 /***********************************************************/ 273 274 int cs8900_e2prom_read(struct eth_device *dev, 275 u8 addr, u16 *value) 276 { 277 cs8900_e2prom_ready(dev); 278 put_reg(dev, PP_EECMD, EEPROM_READ_CMD | addr); 279 cs8900_e2prom_ready(dev); 280 *value = get_reg(dev, PP_EEData); 281 282 return 0; 283 } 284 285 286 /***********************************************************/ 287 /* write a 16-bit word into the EEPROM */ 288 /***********************************************************/ 289 290 int cs8900_e2prom_write(struct eth_device *dev, u8 addr, u16 value) 291 { 292 cs8900_e2prom_ready(dev); 293 put_reg(dev, PP_EECMD, EEPROM_WRITE_EN); 294 cs8900_e2prom_ready(dev); 295 put_reg(dev, PP_EEData, value); 296 put_reg(dev, PP_EECMD, EEPROM_WRITE_CMD | addr); 297 cs8900_e2prom_ready(dev); 298 put_reg(dev, PP_EECMD, EEPROM_WRITE_DIS); 299 cs8900_e2prom_ready(dev); 300 301 return 0; 302 } 303 304 int cs8900_initialize(u8 dev_num, int base_addr) 305 { 306 struct eth_device *dev; 307 struct cs8900_priv *priv; 308 309 dev = malloc(sizeof(*dev)); 310 if (!dev) { 311 free(dev); 312 return 0; 313 } 314 memset(dev, 0, sizeof(*dev)); 315 316 priv = malloc(sizeof(*priv)); 317 if (!priv) { 318 free(priv); 319 return 0; 320 } 321 memset(priv, 0, sizeof(*priv)); 322 priv->regs = (struct cs8900_regs *)base_addr; 323 324 dev->iobase = base_addr; 325 dev->priv = priv; 326 dev->init = cs8900_init; 327 dev->halt = cs8900_halt; 328 dev->send = cs8900_send; 329 dev->recv = cs8900_recv; 330 331 /* Load MAC address from EEPROM */ 332 cs8900_get_enetaddr(dev); 333 334 sprintf(dev->name, "%s-%hu", CS8900_DRIVERNAME, dev_num); 335 336 eth_register(dev); 337 return 0; 338 } 339